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Title: Conductive surface states and Kondo exhaustion in insulating YbIr3Si7

Journal Article · · Physical Review. B
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  1. Rice University, Houston, TX (United States)
  2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  3. Rice University, Houston, TX (United States); University of British Columbia, Vancouver, BC (Canada); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  4. University of British Columbia, Vancouver, BC (Canada); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  5. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  6. University of British Columbia, Vancouver, BC (Canada)
  7. National Synchrotron Radiation Research Center (NSRRC), Taiwan (China)
  8. Johns Hopkins University, Baltimore, MD (United States)
  9. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  10. Harvey Mudd College, Claremont, CA (United States)
  11. Canadian Light Source, Inc., Saskatoon (Canada)
  12. University of St. Andrews (United Kingdom)
+ Show Author Affiliations

The interplay of Kondo screening and magnetic ordering in strongly correlated materials containing local moments is a subtle problem. Usually the number of conduction electrons per unit cell matches or exceeds the number of moments, and a Kondo-screened heavy Fermi liquid develops at low temperatures. Changing the pressure, magnetic field, or chemical doping can displace this heavy Fermi liquid in favor of a magnetically ordered state. Alternatively, Kondo singlet formation can be suppressed when the number of conduction electrons is small compared to the number of magnetic moments, known as the Kondo exhaustion scenario. Furthermore we report the discovery of such an “exhausted” Kondo lattice material, YbIr3Si7, where the bulk electrical conductivity tends to zero in the antiferromagnetic state below the Néel temperature TN = 4.1 K, as all the free carriers are consumed in the formation of Kondo singlets. By contrast, the surface is conducting, as the Yb3+ ions relax into larger nonmagnetic Yb2+ in the presence of reduced chemical pressure, which shifts the chemical potential.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE; Robert A. Welch Foundation; National Science Foundation (NSF)
Grant/Contract Number:
SC0019503; C-2114; DMR-1644779; DMR-1539918
OSTI ID:
2281382
Journal Information:
Physical Review. B, Vol. 109, Issue 3; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electrical conductivity
Kondo insulators
Single crystal materials
Strongly correlated systems
Hard x-ray photoelectron spectroscopy
Neutron diffraction
Resistivity measurements
Specific heat measurements